BYW172G-TAP Equivalent & Substitute Parts

Part Overview

The BYW172G-TAP is a 400V, 3A avalanche diode manufactured by Vishay General Semiconductor - Diodes Division in SOD-64 axial through-hole packaging. This component is classified as an active product and is RoHS3 compliant. The BYW172G-TAP features fast recovery characteristics with a reverse recovery time of 100 nanoseconds, making it suitable for applications requiring rapid switching performance. Equivalent and substitute parts are identified based on matching electrical ratings: 400V DC reverse voltage, 3A average rectified current, and through-hole axial mounting configuration.

Substiute Parts

BYW172G-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 1178BYW172G-TAP Datasheet

Current PartRFQ

1N5404-G

Comchip TechnologyIn Stock: 2089711N5404-G Datasheet

MFR RecommendedRFQ

1N5404G

onsemiIn Stock: 14341N5404G Datasheet

MFR RecommendedRFQ

1N5404RLG

onsemiIn Stock: 169101N5404RLG Datasheet

MFR RecommendedRFQ

EGP30G

onsemiIn Stock: 6047EGP30G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BYW172G-TAP is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 400V
• Current - Average Rectified (Io): 3A
• Mounting Type: Through Hole
• Package Configuration: Axial

Acceptable Variation Parameters:

• Technology: Avalanche or Standard recovery types are acceptable substitutes provided voltage and current ratings match
• Reverse Recovery Time (trr): Substitute parts may have different recovery speeds (fast recovery ≤500ns or standard recovery >500ns)
• Forward Voltage (Vf): Variations within the 400V/3A rating class are acceptable
• Reverse Leakage Current: Variations within the 400V/3A rating class are acceptable
• Operating Temperature Range: Substitute parts may have different junction temperature ranges
• Package Designation: DO-27, DO-201AA, and DO-201AD are equivalent axial through-hole packages

The substitute parts identified below meet the mandatory matching parameters and are therefore electrically and mechanically compatible with the BYW172G-TAP in applications requiring 400V, 3A rectification with through-hole axial mounting.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 1N5404-G (Comchip Technology)

The 1N5404-G is the recommended primary substitute for the BYW172G-TAP. This part maintains all mandatory electrical parameters (400V, 3A) and is classified as an active product, indicating ongoing manufacturer support and availability. The 1N5404-G is supplied in Cut Tape packaging with 208,868 pieces in stock, providing reliable supply chain continuity. Both parts are RoHS3 compliant and REACH unaffected. The primary difference is recovery speed classification: the BYW172G-TAP features fast recovery (100ns trr) while the 1N5404-G operates at standard recovery speeds. This distinction is acceptable in applications where switching speed is not a critical constraint.

Secondary Substitutes: 1N5404G and 1N5404RLG (onsemi)

Both onsemi variants (1N5404G and 1N5404RLG) meet the mandatory electrical and mechanical requirements. However, both are designated "Not For New Designs," indicating that onsemi has discontinued active development and support for these parts. The 1N5404RLG offers superior inventory availability (16,846 pieces) compared to 1N5404G (1,352 pieces). These parts are suitable for legacy system maintenance and repair applications where existing designs already incorporate these components.

Fast Recovery Alternative: EGP30G (onsemi)

The EGP30G provides fast recovery characteristics (50ns trr) matching the performance profile of the BYW172G-TAP. This part is designated "Not For New Designs" and carries lower inventory (5,966 pieces). The EGP30G is appropriate for applications requiring fast switching performance in legacy or existing designs. The forward voltage specification (1.25V @ 3A) and reverse leakage (5µA @ 400V) fall within acceptable ranges for 400V/3A rectifier applications.

Temperature Range Consideration:

The BYW172G-TAP operates across -55°C to 175°C, providing the widest junction temperature range among all listed parts. Substitute parts operate within -65°C to 125°C or -65°C to 150°C ranges. Applications requiring operation above 150°C must retain the BYW172G-TAP.

Frequently Asked Questions (FAQ)

Q: Can the 1N5404-G directly replace the BYW172G-TAP in my circuit?

A: Yes, the 1N5404-G is electrically and mechanically compatible. Both parts share identical voltage (400V) and current (3A) ratings with through-hole axial mounting. The primary difference is recovery speed: the BYW172G-TAP features fast recovery (100ns) while the 1N5404-G operates at standard recovery speeds (>500ns). This substitution is valid for applications where switching speed is not a critical performance parameter.

Q: What is the difference between SOD-64 and DO-27 packaging?

A: SOD-64 and DO-27 (DO-201AD) are both axial through-hole package designations for diodes. These packages are mechanically and electrically equivalent for through-hole PCB mounting applications. The primary difference is the physical package outline and lead diameter. Both accommodate standard through-hole PCB holes and are suitable for wave soldering and manual insertion processes.

Q: Why are some substitute parts marked "Not For New Designs"?

A: Parts designated "Not For New Designs" indicate that the manufacturer has discontinued active development and support. These parts remain available for existing designs and legacy system maintenance but are not recommended for new product development. The 1N5404-G (Comchip) is the recommended choice for new designs as it maintains active product status.

Q: Can I use the EGP30G as a substitute if my application requires fast switching?

A: Yes, the EGP30G is suitable for applications requiring fast recovery performance. The EGP30G features a 50ns reverse recovery time, which is faster than the BYW172G-TAP (100ns). Both parts maintain the 400V/3A electrical ratings and through-hole axial mounting configuration. The EGP30G is designated "Not For New Designs," making it appropriate for legacy system applications.

Q: What is the maximum junction temperature for substitute parts?

A: The BYW172G-TAP operates to 175°C junction temperature. Substitute parts operate within the following ranges: 1N5404-G (125°C), 1N5404G (150°C), 1N5404RLG (150°C), and EGP30G (150°C). Applications requiring operation above 150°C must use the BYW172G-TAP or identify alternative parts with higher temperature ratings.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all identified substitute parts (1N5404-G, 1N5404G, 1N5404RLG, and EGP30G) are RoHS3 compliant and REACH unaffected, matching the compliance status of the BYW172G-TAP.

Q: What is the difference in reverse leakage current between these parts?

A: Reverse leakage current varies among the substitute parts at 400V: BYW172G-TAP (1µA), 1N5404-G (5µA), 1N5404G (10µA), 1N5404RLG (10µA), and EGP30G (5µA). These variations are within acceptable ranges for 400V/3A rectifier applications. Applications with strict leakage specifications should select parts with lower leakage values.

Q: Can I mix different substitute parts in the same circuit?

A: Yes, all identified substitute parts are electrically equivalent at the 400V/3A rating level and can be used interchangeably in the same circuit. However, mixing parts with different recovery speeds (fast vs. standard) may introduce minor timing variations in switching applications. For consistency, use the same part number throughout a design.